TheeconomyofDallas,Texas,isstronganddiversified.
Anearlytypewriterproducedlettersquicklyandneatly;thetypist,_____couldn'tseehisworkonhismachine.
为了研究不同数学模式对学生代数成绩的影响,三位教师分别采用三种不同的模式执教三个班的代数课,这一研究中的自变量和因变量是()
Weareinterestedintheweatherbecauseit_____ussodirectly------whatwewear,whatwedo,andevenhowwefeel.
AfewmonthsafterhehadarrivedinChina,Mr.Smith___________inlovewiththepeopleandculturethere.